PALAEONTOLOGY OF NEW-YORK. 
In another specimen of less size than fig. 8, which has been compressed in a 
direction parallel to the vertical axis, the height of the spire is nearly twice as 
great as in the one figured. 
PLATE CXY. 
Fig. 8. A fragment of a specimen, apparently of this species, preserving a little more than 
one volution and a part of the aperture, with the pillar-lip, which is thickened 
and smooth. 
Geological position and localities. In the Oriskany sandstone : Albany, Schoharie, 
Greene and Ulster counties, and elsewhere in New-York; and in the same rock in 
Maryland and Virginia. 
Strophostylus transversus (n. s.). 
Plate CXIV. Fig. 1 a , b, c. 
Shell obliquely ovate, symmetrical. Spire little elevated : volutions about 
four, the last one extremely ventricose and very much extended on the 
margin ; aperture subcircular ; outer lip very thin, curving downwards 
and spreading over the surface of the adjacent volution. Columellar lip 
spirally grooved : suture canaliculate. 
Surface finely striated in direction parallel to the lines of growth, with 
a few more strongly marked imbricating lines of growth. 
This species is remarkable for the great lateral extension of the last volution in 
the aperture : the spire is very neatly tapering, and of little bulk beyond the first 
volution. In the specimen figured, the greatest height of the aperture is equal to its 
greatest width from the columellar lip; its oval appearance in the figure being due 
to turning the shell so as to bring the spire into view, which is not seen when 
looking directly into the aperture. 
Fig. 1 a. View of the spire, with the aperture placed horizontally. 
Fig. 1 b. View of the aperture, which is narrowed by turning the upper margin forward. 
Fig. 1 c. Profile view of the shell from the upper side. 
Geological position and locality. In the Oriskany sandstone : Cumberland, Md. 
Stropkostylns expansus. 
Plate CXIV. Fig.2&3«, 6 . 
Platyceras expansus : Coxrad, Annual Report on the Palaeontology of New-York for 1841, p. 55. 
Shell “dilated, suborbicular : spire small, not prominent, with three 
“ volutions; aperture profoundly dilated; labrum angulated.” 
